[Fixed] Report Generation in Node.js Using Node-Jasper Package

Issue

I am trying to generate a report using node-jasper package in node.js.
When i write the code without class implementation then the code works fine following is the workable code.

jasper = require('node-jasper')({
        path: '../lib/jasperreports-5.6.0',
        reports: {
            hw: {
                jasper: '../jasperFiles/NodeIreportTest.jasper'
            }
        },
        drivers: {
            mysql: {
                path: '../lib/com.mysql.jdbc_5.1.5.jar',
                class: 'com.mysql.jdbc.Driver', //odbc driver//sun.jdbc.odbc.JdbcOdbcDriver //mysqlDriver// com.mysql.jdbc.Driver
                type: 'mysql'
            }
        },
        conns: {
            dbserver1: {
                host: '192.168.1.164',
                port: 3306,
                dbname: 'dbname',
                user: 'user',
                pass: '1234',
                driver: 'mysql'
            }
        },
        defaultConn: 'dbserver1'
    });

Following is complete object found when i debug the code. which is having (hm) property.

but when i tried to introduce the classes and make the code standard i get and error TypeError: self.hm is not a constructor
following is class implementation of the same code

class ReportModel {
    constructor(strJasperPath, objDataObject, intClientIP) {
        this.strJasperPath = strJasperPath;
        this.objDataObject = objDataObject;
        this.intClientIP = intClientIP;
    }

    makeReport() {

        return new Promise ((resolve, reject) => {
            jasper = require('node-jasper')({
                path: '../lib/jasperreports-5.6.0',
                reports: {
                    hw: {
                        //jasper: '../jasperFiles/NodeIreportTest.jasper'
                        jasper: '../jasperFiles/' + this.strJasperPath + '.jasper' //path to report
                    }
                },
                drivers: {
                    mysql: {
                        path: '../lib/com.mysql.jdbc_5.1.5.jar',
                        class: 'com.mysql.jdbc.Driver', //odbc driver//sun.jdbc.odbc.JdbcOdbcDriver //mysqlDriver// com.mysql.jdbc.Driver
                        type: 'mysql'
                    }
                },
                conns: {
                    dbserver1: {
                        host: '192.168.1.164',
                        port: 3306,
                        dbname: 'dbname',
                        user: 'user',
                        pass: '1234',
                        driver: 'mysql'
                    }
                },
                defaultConn: 'dbserver1'
            });



            var report = {
                report: 'hw',
                data: this.objDataObject
            }
            var pdf = jasper.pdf(report);


            var strReportName = this.strJasperPath + intClientIP + '.pdf'
            var filepath = "./reports/" + strReportName

            var filename = {
                "filepath": serverConfig.reporthost + path.basename(filepath)
            };

            //check if file is present or not 
            fs.access(filepath, fs.constants.F_OK | fs.constants.W_OK, (err) => {
                if (err) {
                    //file is not present 
                    fs.writeFile("./reports/" + strReportName, new Buffer(pdf, 'binary'), (err) => {
                        if (err) {
                            reject(err);
                        }
                        resolve(filename);
                    });
                } else {
                    //file is present then delete it and then create it 
                    fs.unlink(filepath, (err) => {
                        if (err) {
                            reject(err);
                        } else {

                            fs.writeFile("./reports/" + strReportName, new Buffer(pdf, 'binary'), (err) => {
                                if (err) {
                                    console.log('WriteFile', err)
                                }
                            resolve(filename);
                            });
                        }

                    });

                }
            });
        });


    }
}

following is the object which is not having hm property with class implementation.

Solution

Step 1) Remove your Jasper declaration out of the class body and remove hw object from it like below code

jasper = require('node-jasper')({
    path: '../lib/jasperreports-5.6.0',
    reports: {
       // hw removed from this place
    },
    drivers: {
        mysql: {
            path: '../lib/com.mysql.jdbc_5.1.5.jar',
            class: 'com.mysql.jdbc.Driver', //odbc driver//sun.jdbc.odbc.JdbcOdbcDriver //mysqlDriver// com.mysql.jdbc.Driver
            type: 'mysql'
        }
    },
    conns: {
        dbserver1: {
            host: '192.168.1.164',
            port: 3306,
            dbname: 'node_incrency_minpcs',
            user: 'RAHUL',
            pass: '1234',
            driver: 'mysql'
        }
    },
    defaultConn: 'dbserver1'
});

Step 2) Add declaration of hw object in constructor like below

constructor(strReportName) {
        jasper.reports = {
            hw: {
                jasper: '../jasperFiles/' + strReportName+ '.jasper' 
            }
        }
    }

Step 3) add other parameters to function body that is makeReport function as makeReport(strJasperPath, objDataObject, intClientIP)

Hope this will work for you.